Perhaps you should try some spelling variations:
"luong van trinh slippers" » "luong va trinh slippers", "duong van trinh slippers", "luong vat trinh slippers", "luong van thinh slippers", "luong van tinh slippers", "luong dan trinh slippers", "luong van trinh slippery", "luong van trinh grippers"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("luong van trinh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("luong van trinh slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luong van trinh slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luong van trinh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.